Exploiting entanglement in communication channels with correlated noise

Details Exploiting entanglement in communication channels with correlated noise Exploiting entanglement in communication channels with correlated noise

2003-09-19

arxiv.org/abs/quant-ph/0309148v1

Physical Review A Vol. 69, 042324 (2004)

Physics

Quantum Physics

9 pages, 5 figures

Scientific paper

10.1103/PhysRevA.69.042324

We develop a model for a noisy communication channel in which the noise affecting consecutive transmissions is correlated. This model is motivated by fluctuating birefringence of fiber optic links. We analyze the role of entanglement of the input states in optimizing the classical capacity of such a channel. Assuming a general form of an ensemble for two consecutive transmissions, we derive tight bounds on the classical channel capacity depending on whether the input states used for communication are separable or entangled across different temporal slots. This result demonstrates that by an appropriate choice, the channel capacity may be notably enhanced by exploiting entanglement.

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